My PW is 46 and then i have 3 Vokeys of 52, 54, 58... the only reason i have a 58 over a 60 (as the 60 is the next logical loft gap) is because its older and alot lighter so i prefer it out of bunkers and feel more comfortable opening the face. In all fairness, its very rare i'd even attempt a full shot with the 58 because i'd rather not take my nose off. I much prefer hitting a half shot with a 52 or 54 than a full shot with a 58. More comfortable controling distance with a smooth, short tempo than a full lash with a 58.
Find what your comfortable with, wedge play is all about control. Watch the pro's... its very rare they hit a full shot when 100-120yards and in. Its usually a small controlled shot, looking to keep traj down and nail the distance down to a 2-5yard miss-margin.
As for loft gaps, the pro at my club only uses a 52 & 58 wedges. I also agree with "Chris Prosser".. you hear alot of people say "stay away from the 60, its not for the amature etc. etc." but go for it. Practise with it, if you get on with it then keep it, if you dont then at least you tried. Wedge play is about practise and finding what your comfortable with.